Will the square resistance of metallized film capacitors increase when they are oxidized?

Oxidation of metallized film capacitors results in the formation of an oxide film on the surface. This oxide film is usually insulating and has a lower conductivity than the metal itself.Therefore, when oxidation occurs on the surface of a metallized film capacitor, this oxide film increases the surface resistance (surface square resistance) of the capacitor, thereby increasing the square resistance of the capacitor.

Specifically, the resistance of an oxide film is typically several orders of magnitude greater than the resistance of the metal itself, which means that as the oxide film forms or thickens, the surface resistance of the capacitor can increase significantly.This can affect the performance of the capacitor in a circuit, particularly where current needs to be transferred across the capacitor surface or to ground, possibly causing signal degradation or distortion.

Therefore, when the metallized film capacitor is oxidized, its surface resistance will increase significantly, which is one of the factors that need to be considered when designing circuits or selecting capacitors.